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The 3rd refinery (phases 4 and 5) is one of the 13th refineries of the South Pars Gas Complex and is located at the westernmost point of Site One of this complex in Asalouye city of Bushehr province. This refinery is constructed after phases 2&3 (second refinery) and phase 1 (first refinery). Pars Oil and Gas Company (POGC) is responsible for the design and construction of South Pars Gas Refineries, which is one of the National Iranian Oil Company branches.
Pars Oil and Gas Company is selected Italian Eni and Iranian companies Petropars and Niko as subcontractors for construction of 3rd refinery. 3rd refinery fully available on April 16th, 2005. The 3rd refinery has two feed supply platforms that are located in sea at 110 km of Asalouye coast, each of these platforms has 15 wells, usually 12 wells are in service. The nominal feed withdrawal from the reservoir is 2000 MMSCFD, currently approximately 2100 MMSCFD of gas is withdrawn from the reservoir. The nominal daily production of the refinery is equivalent to 50 million cubic meters of sweet gas (more than 9% of the total production of the SPGC), 80,000 barrels of gas condensate, 2,000 tons of propane and 1,200 tons of butane (in total more than 16% of the total production of LPG of SPGC), 2,600 tons of ethane and 400 tons of sulfur. In the design and construction of this refinery, the production of required utilities has also been considered. To supply and produce the required electricity, the refinery has four GTGs. This refinery has one seawater storage tank, three desalination units and six boilers for steam generation. Compressed air, liquid nitrogen and required cooling fluid are also produced in the refinery. It should be noted that the centralized water intake unit by the sea, supplies the water needed by the refineries of the Site One of complex, including the 3rd refinery. Six GTC are utilized for sending the sweet gas to the IGAT. The 3rd refinery has four gas condensate storage tanks and four propane and butane storage tanks. The ethane product is sent as petrochemical plants feed through the pipelines. In recent years, in order to improve reliability, increase efficiency and maintain production capacity, part of the refinery feed is supplied through the 18-inch line from the 4th refinery. Backup electricity by connection to the national power grid have also been set up. The comprehensiveness of the product portfolio of this refinery is making it suitable for the design of other refineries, so that phases 9 and 10 (5th refinery), 15 and 16 (6th refinery), 17 and 18 (7th refinery) and 20, 21 (8th refinery) are constructed similar to phases 4 & 5.